2014ApJ...788...83M


Query : 2014ApJ...788...83M

2014ApJ...788...83M - Astrophys. J., 788, 83 (2014/June-2)

A modern search for Wolf-Rayet stars in the Magellanic Clouds: first results.

MASSEY P., NEUGENT K.F., MORRELL N. and HILLIER D.J.

Abstract (from CDS):

Over the years, directed surveys and incidental spectroscopy have identified 12 Wolf-Rayet (WR) stars in the Small Magellanic Cloud (SMC) and 139 in the Large Magellanic Cloud (LMC), numbers which are often described as "essentially complete." Yet, new WRs are discovered in the LMC almost yearly. We have therefore initiated a new survey of both Magellanic Clouds using the same interference-filter imaging technique previously applied to M31 and M33. We report on our first observing season, in which we have successfully surveyed ∼15% of our intended area of the SMC and LMC. Spectroscopy has confirmed nine newly found WRs in the LMC (a 6% increase), including one of WO-type, only the third known in that galaxy and the second to be discovered recently. The other eight are WN3 stars that include an absorption component. In two, the absorption is likely from an O-type companion, but the other six are quite unusual. Five would be classified naively as "WN3+O3 V," but such a pairing is unlikely given the rarity of O3 stars, the short duration of this phase (which is incommensurate with the evolution of a companion to a WN star), and because these stars are considerably fainter than O3 V stars. The sixth star may also fall into this category. CMFGEN modeling suggests these stars are hot, bolometrically luminous, and N-rich like other WN3 stars, but lack the strong winds that characterize WNs. Finally, we discuss two rare Of?p stars and four Of supergiants we found, and propose that the B[e] star HD 38489 may have a WN companion.

Abstract Copyright:

Journal keyword(s): galaxies: individual: (LMC, SMC) - galaxies: stellar content - Local Group - stars: evolution - stars: Wolf-Rayet

Nomenclature: Tables 1-2, Text: [MNM2014] LMCNNN-NW N=9+8. Table 2, Text: [MNM2014] SMC159-2 N=1.

Simbad objects: 45

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Number of rows : 45
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 HD 108 SB* 00 06 03.3890541936 +63 40 46.771220928 6.79 7.58 7.40     O4-8f?p 317 0
2 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1073 0
3 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12024 1
4 SV* HV 4476 s*b 00 43 02.5144653408 +41 49 12.212124096 16.378 17.273 17.426 17.242 17.241 LBV 50 0
5 NAME SMC 159-2 * 00 49 58.72 -73 19 28.4           O8f?p 5 0
6 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10463 1
7 HD 5980 WR* 00 59 26.5838833944 -72 09 53.927337312   11.13 11.31   11.029 WN4+O7I: 376 1
8 SMC AB 12 WR* 01 02 52.4011237800 -72 06 52.532688348   16 16.08     WN3ha 20 0
9 RMC 31 WR* 01 03 25.2272050176 -72 06 43.857668340   12.11 12.30     WN3:h+O5.5V+O5.5If+O7.5V 110 0
10 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1179 2
11 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5571 1
12 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6496 1
13 IRSF J04513837-6929542 s*b 04 51 38.3835449112 -69 29 54.180532824           O3.5O6If 1 0
14 SSTISAGEMC J045303.77-692351.6 WR* 04 53 03.765 -69 23 51.94 13.167 14.210 14.391 14.04 14.402 WN3b+abs 8 0
15 NAME KMHK309s Cl* 04 56 26.230 -67 56 18.60           ~ 14 0
16 IRSF J05032328-7020065 s*b 05 03 23.2796049312 -70 20 06.507822552           O3.5If+O6-7 1 0
17 IRSF J05043264-6800594 WR* 05 04 32.6359261368 -68 00 59.427934956           WN3+O3V 6 0
18 [M2002] LMC 71747 WR* 05 07 13.3240414848 -70 33 33.934915800           WN3+O3V 6 0
19 IRSF J05134985-6923216 * 05 13 49.8679780752 -69 23 21.745655304           O8f?p 5 0
20 HD 269321 s*b 05 17 56.0734487568 -69 16 03.809703252 10.28 10.93 10.84 10.53 10.342 B5Iae 63 0
21 [MNM2014] LMC195-1 WR* 05 18 10.33 -69 13 02.5           WO2 5 0
22 [H2013] LMCe 584 * 05 18 11.01 -69 13 11.3 12.88 14.26 13.95     WO4 11 0
23 V* S Dor sg* 05 18 14.3570612088 -69 15 01.149576912 9.08 10.39 10.25 9.74 9.14 A5Iaeq 366 0
24 HD 269333 WR* 05 18 19.2104631720 -69 11 40.657335684 10.375 11.23 11.29 11.47 11.412 WN+BI 57 0
25 NGC 1910 As* 05 18 42.50 -69 14 12.1     9.65     ~ 50 1
26 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16407 1
27 IRSF J05282712-6906362 WR* 05 28 27.1205771568 -69 06 36.223704360           WN3+O3V 6 0
28 IRSF J05291819-6919432 WR* 05 29 18.1865203488 -69 19 43.178139840           WN3+O3V 8 0
29 IRSF J05350090-6921202 WR* 05 35 00.9082434480 -69 21 20.260672056           WN3+O3V 6 0
30 IRSF J05352853-6940090 WR* 05 35 28.5224275800 -69 40 08.931198720           WN3+O8-9III 5 0
31 HD 37974 s*b 05 36 25.8534763728 -69 22 55.789571064 10.056 11.12 10.99 11.00 10.423 B0.5e 118 0
32 TYC 9167-691-1 s*b 05 36 38.7695004816 -69 27 59.455685340 11.573 12.614 12.726   12.928 O7.5Iaf 4 0
33 IRSF J05374762-6921136 WR* 05 37 47.6086343712 -69 21 13.572367920           WN3+O7.5V 5 0
34 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1899 1
35 CPD-69 471 * 05 39 11.6284 -69 30 37.417 11.415 12.374 12.273   12.275 O2-3(n)fp 15 0
36 [MNM2014] LMC174-3E * 05 39 12.12 -69 30 36.3           O4V 1 0
37 IRSF J05394286-6926528 s*b 05 39 42.8598134400 -69 26 52.810408248           O4Ifc 1 0
38 [MNM2014] LMC174-1 WR* 05 40 03.57 -69 37 53.1           WN3+O 6 0
39 HD 38489 s*b 05 40 13.3208083008 -69 22 46.485962112 11.236 12.295 11.93 11.79 10.891 B[e] 84 1
40 CD-47 4551 s*b 08 57 54.6180604176 -47 44 15.708893424 9.11 9.41 8.54 8.92   O5Ifc 70 0
41 * eta Car Em* 10 45 03.5377808928 -59 41 04.051599720 6.37 7.03 6.48 4.90 4.41 OBepec 2354 0
42 NGC 3603 OpC 11 15 11 -61 15.5           ~ 1024 1
43 HD 148937 SB* 16 33 52.3869185520 -48 06 40.476418740 6.49 7.12 6.71 7.61   O6f?p 374 4
44 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1506 0
45 NAME Local Group GrG ~ ~           ~ 7838 0

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2022.12.05-08:45:27

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